Problem:
 a() -> a()
 a() -> b()
 g(b()) -> g(g(b()))
 g(g(a())) -> a()

Proof:
 Uncurry Processor:
  a() -> a()
  a() -> b()
  f3(g(),b()) -> f3(g(),f3(g(),b()))
  f3(g(),f3(g(),a())) -> a()
  Ground Confluence Processor:
   UNC by decision procedure.